Ok, I am 21, I consider myslef a healthy man, and I am worried about not being able to perform as I should at my age. I recently have had several incident where my erection has gone down without coming during the act and I had to pretend I just came fast, and some times in the latest incident I had a fine erection but right when we were alone with my girlfriend it just would not work. As you can tell, this is extremely embarrasing and frustrating. This does not usually happens, I used to be able to perform in any circumstance, but I am worried because I have noticed my sexual performance has stedily decreased, especially for only being 21. If I do have succesful sex, I can now only come once and have to call it a night. I am seriously thinking of buying VIAGRA or Prelox Blue as a plan B, but I am afriad I might become dependent and tolerant on the stuff and it won't work when I actually do need it some years down the road. Is this normal or is it possible that I have an ED? Is there something I can try before going into trying pills? Any words of advice will be really helpful.

I'll bet you are a very healthy young man and that there may be some kind of anxiety or uneasiness that began all of this. Many men have had this experience and I too have experienced it. I know how frustrating and embarrasing it is. Ask yourself this - other than the times you've experienced trouble, is there anything at all that is making you uneasy, nervous, or on edge? Those things will kill erections. Some refer to it as performance anxiety. Once it happens I believe it compounds the worry factor the next time you try to have sex. It is a serious mind trip, you know?

Seriously, it sounds like you're very healthy. I'll bet it may have something to do with nervousness or hidden anxiety.